LF for the accentdeprived
Join Date: May 2005
Location: Budapest, Hungary
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I'm afraid it's prolly the cranks. IIRC it happened to a bunch of people w/ ISIS cranks, even on freewheels!
(So far the most solid BB/crank interface for fixed seems to be the good old square taper, BTW)
As usual, the BB is steel, the crank is Al, so the BB is probably fine and the crank is shot.
I'd try some brutality on the interface. E.g. threadlock on both the splines and the threads, and go crazy with the wrench. Hopefully it'll hold up that way. You might be in trouble when you want to get it off, though.